Diplomatic Fast Stream (prev. FCO) Preparation (2026)

Our PrepPack provides comprehensive preparation for the Diplomatic Fast Stream's online tests and assessment centre, ensuring you're fully equipped for every stage of the process.

• 2 Case Study Practice Tests: Prepare for the case study assessment with 2 full practice case studies, each including model answers, a presentation exercise, and a scoring form
• 5 Situational Judgement Tests: Practise realistic workplace scenarios with 5 full-length situational judgement tests
• 1 Full-Length Personality Test: Assess how you approach work-related challenges, communication, and decision-making in a team environment
• 3 Group & Role-Play Exercises: Prepare for the interpersonal exercises at the assessment centre with 2 group exercises and 1 role-play exercise
• 3 Interview Preparation Resources: A full PDF guide, a video walkthrough, and a breakdown of the most common questions you're likely to be asked to help you succeed at the competency-based interview
• 14 In-Depth Study Guides: Detailed guidance across situational judgement, case study technique, personality profiling, group dynamics, and interview preparation, so you're never practising without direction
• Bonus – Numerical & Verbal Reasoning Practice Tests: Extra practice to sharpen the core analytical skills that underpin the case study and work-based scenario exercises

With materials designed to prepare you for the assessment centre and every exercise within it, this PrepPack gives you everything you need to succeed.

The Diplomatic Fast Stream is the Foreign, Commonwealth & Development Office's scheme within the Civil Service Fast Stream. Like every scheme, it follows the same core application journey, consisting of online tests, an assessment centre, and a final selection board, and successful candidates join the same graduate leadership programme.

What sets it apart is where it leads.

This scheme is built around the FCDO's mission of diplomacy, international development, and consular work, with a career structure that takes you overseas rather than keeping you within a single UK department. It's also one of the most competitive routes on offer - recruitment data over the past few years shows an average success rate of just 0.2 - 0.6%, among the lowest of any Fast Stream scheme.

There's also a related Diplomatic and Development Economics variant, aimed at candidates with an economics-heavy degree.

Let's take a closer look at how the Diplomatic and Development Fast Stream differs from other schemes.

Unlike most Fast Stream schemes, which typically run for two years, the Diplomatic Fast Stream is a five-year journey.

Your first two years are spent in the UK, on twelve-month placements at the department's headquarters in London or East Kilbride. From year three onwards, you move into an overseas posting for the remainder of the scheme.

This isn't a scheme for anyone hoping to settle in one place. Full mobility, both across the UK and abroad, isn't a preference but a condition of the role.

Before starting on the Diplomatic and Development Fast Stream, candidates must obtain Developed Vetting (DV) clearance, the highest level of UK security clearance, reserved for roles with access to the most sensitive information.

DV takes considerably longer than standard checks. It involves an in-depth look into your background over the last ten years, extends to your partner or spouse, and always includes a formal interview with a vetting officer.

Where lower-level checks can clear in a matter of weeks, DV is officially targeted at 95 days and can, in practice, take over six months. It's worth starting to prepare the information you'll need well ahead of applying.

The Diplomatic Fast Stream follows the same core stages as every other scheme. Our online test preparation and assessment centre preparation guides cover exactly what you'll face, from the initial assessments through to the final stages, and our Diplomatic Fast Stream PrepPack brings everything you need together in one place.

Founded in 1992, JobTestPrep has over three decades of experience helping candidates navigate competitive recruitment processes, including thousands preparing for the UK Civil Service and graduate programmes like the Diplomatic and Development Fast Stream. Our preparation materials are developed by experts and regularly updated to reflect the latest test formats. With over 220 preparation courses and one million job seekers supported worldwide, we offer professionally designed PrepPacks alongside advanced tools, including our AI-powered CV Analyser and Interview Prep platforms. Together, these resources help candidates across the UK and globally strengthen their applications, improve their performance, and achieve outstanding results.